Add ActiveRPC (akullpp#876)

Author: valerialistratova

README.md

@@ -601,6 +601,7 @@ _Tools that help send messages between clients to ensure protocol independency._
 
 _Tools for creating and managing microservices._
 
+- [ActiveRPC](https://rpc.activej.io) - Lightweight and fast library for complex high-load distributed applications and Memcached-like solutions.
 - [Apollo](https://spotify.github.io/apollo/) - Libraries for writing composable microservices.
 - [Armeria](https://github.com/line/armeria) - Asynchronous RPC/REST client/server library built on top of Java 8, Netty, HTTP/2, Thrift and gRPC.
 - [consul-api](https://github.com/Ecwid/consul-api) - Client for the Consul API: a distributed, highly available and datacenter-aware registry/discovery service.